Paper sheets inspection apparatus

ABSTRACT

According to one embodiment, a paper sheets inspection apparatus includes a transfer mechanism configured to transfer paper sheets through an inspection position, a guide member including a guide surface opposed to the paper sheet at the inspection position, a standard plate on the guide member, including a reflection surface exposed on the guide surface at the inspection position, an air supply device configured to spout air flowing from a lateral position of the standard plate along the reflection surface, and form an air curtain between the standard plate and the paper sheet, a light source configured to radiate inspection light toward the reflection surface, and a photoreceptor configured to receive the inspection light reflected from the reflection surface of the standard plate and the inspection light reflected from a surface of the paper sheet at the inspection position.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2010-208488, filed Sep. 16, 2010; the entire contents of which are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to an inspection apparatus configured to inspect paper sheets such as bills, valuable securities, and the like.

BACKGROUND

In recent years, a large number of bills are handled daily in banks, large-scale retailers, and the like, and a business of sorting and arranging these bills in accordance with the denomination or degree of defacement exists. As an apparatus configured to automate such an arrangement business of bills, a paper currency processing apparatus is proposed. This paper currency processing apparatus is provided with an inspection device configured to inspect types and the degree of defacement of bills, a plurality of accumulation storages in which inspected bills are classified into denominations or the like to be accumulated, a banding section configured to put a paper band around a bundle of bills, and the like.

The inspection device configured to optically inspect types of paper sheets is provided with a transfer mechanism configured to transfer paper sheets through an inspection position, a light source configured to irradiate the paper sheets transferred to the inspection position with inspection light, a photoreceptor configured to receive reflection light from the surface of the paper sheets, a standard plate arranged at the inspection position, and the like.

When the gain of the photoreceptor is to be set, the gain is adjusted by using reflection light from the standard plate as a criterion. When the standard plate of the inspection device is defaced, inspection results of the paper sheets are adversely affected. Thus, an apparatus in which an air nozzle is provided above a standard plate, and dust is prevented from adhering to the standard plate by blowing air onto the standard plate from above is proposed.

In the inspection device described above, at the time of inspection, when a paper sheet is transferred to the inspection position, the paper sheet covers the standard plate to hide the standard plate, and hence it is not possible to blow air onto the standard plate by using the air nozzle. Accordingly, during this time, dust cannot be blown away, dust, paper scraps and the like adhere to the standard plate, and the possibility of the standard plate being defaced is conceivable. Further, the paper sheets themselves come into contact with the standard plate, and the possibility of the paper sheets defacing the standard plate is conceivable.

On the other hand, although the paper sheets are attracted to a transfer belt and transferred to the inspection position, depending on the state of the paper sheets, they are transferred without being sufficiently attracted to the transfer belt. In this case, the paper sheets cannot be correctly transferred to the inspection position, thereby adversely affecting the inspection results.

BRIEF DESCRIPTION OF THE DRAWINGS

A general architecture that implements the various features of the embodiments will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate the embodiments and not to limit the scope of the invention.

FIG. 1 is an exemplary view schematically showing a paper currency processing apparatus according to an embodiment;

FIG. 2 is an exemplary side view showing a paper currency inspection device of the paper currency processing apparatus;

FIG. 3 is an exemplary perspective view showing the vicinity of a guide plate of the paper currency inspection device with a transfer belt and transfer rollers thereof omitted;

FIG. 4 is an exemplary perspective view showing the paper currency inspection device;

FIG. 5 is an exemplary perspective view of the paper currency inspection device obtained when the paper currency inspection device is viewed from a direction different from FIG. 3;

FIG. 6 is an exemplary perspective view showing the paper currency inspection device in a state where a bill is transferred to an inspection position;

FIG. 7 is an exemplary side view of the paper currency inspection device shown by being partially cut away; and

FIG. 8 is a cross-sectional view showing a guide plate, air nozzle, and white standard plate of the paper currency inspection device.

DETAILED DESCRIPTION

Various embodiments will be described hereinafter with reference to the accompanying drawings.

In general, according to one embodiment, In general, according to an embodiment, a paper sheets inspection apparatus comprise a transfer mechanism configured to transfer paper sheets through an inspection position; a guide member including a guide surface opposed to the paper sheet at the inspection position; a standard plate on the guide member, including a reflection surface exposed on the guide surface at the inspection position; an air supply device configured to spout air flowing from a lateral position of the standard plate along the reflection surface, and form an air curtain between the standard plate and the paper sheet; a light source configured to radiate inspection light toward the reflection surface of the standard plate; and a photoreceptor configured to receive the inspection light reflected from the reflection surface of the standard plate, and the inspection light reflected from a surface of the paper sheet at the inspection position.

FIG. 1 schematically shows a paper currency processing apparatus according to an embodiment. A paper currency processing apparatus 10 configured to process, for example, paper currency as the paper sheets comprises a supply section 11 on which a large number of bills P are placed in a stacked state, a pick-up mechanism 14 configured to pick up the bills P from the supply section 11 one by one, and a transfer path 16 configured to transfer the bills P picked up by the pick-up mechanism 14. In the transfer path 16, a plurality of sets of endless transfer belts (not shown) are arranged to extend in such a manner that the transfer path 16 is interposed between the belts. The picked up bills are transferred by the transfer belts with being held between the belts.

An auditing device 18 configured to audit the bills P transferred through the transfer path 16 one by one is arranged along the transfer path 16. The auditing device 18 detects the denomination, shape, thickness, top/back, genuineness/counterfeitness, normality/defacement, two-sheet pick-up, and the like of the bills P transferred thereto. The auditing device 18 comprises an inspection device 20 configured to inspect the type of the bill P, a shape detection device 22 configured to inspect the shape of the bill, a magnetic sensor 23, and a thickness detection device 24. Here, normality/defacement detection implies detection of a normal bill which can be recirculated, and a defaced bill which has a stain, damage, and the like, and cannot be recirculated.

A rejection section 26 is provided along the transfer path 16, and a plurality of accumulation/banding devices 28 a, 28 b, 28 c, and 28 d each of which is configured to accumulate and band bills are arranged side by side. Bills P which have passed through the auditing device 18 are separated into rejected bills and to-be-processed bills by a gate (not shown). The rejected bills imply bills which have been judged to be counterfeit bills by the auditing device 18, or bills judged to be out of recognition due to a fold, tear, skew, two-sheet extraction, and the like. The rejected bills are rejected and accumulated in the rejection section 26. The rejected bills accumulated in the rejection section 26 are set at the supply section 11 again to be taken in again except the counterfeit bills, or their number is reckoned in the enumeration data by a manual input operation. Audit results obtained by the auditing device 18 such as a processed amount, the number of bills, and the like are sent to a main control section (not shown) to be preserved, and are displayed on a monitor (not shown).

Further, the to-be-processed bills are bills P which are judged to be genuine bills by the auditing device 18, and are normal bills or defaced bills. Among the to-be-processed bills, the normal bills are sent to the accumulation/banding devices 28 a, 28 b, 28 c, and 28 d to be accumulated, and are banded by paper bands as bundles of a predetermined number of sheets. For example, when the normal bills are classified into font/back face bills to be accumulated and banded, front face bills are sorted and accumulated in the accumulation/banding device 28 a or 28 b, and back face bills are sorted and accumulated in the accumulation/banding device 28 c or 28 d. The defaced bills are sent to a shredder 29 to be shredded.

Next, the aforementioned inspection device 20 will be described in detail. FIG. 2 shows the overall inspection device 20, and FIGS. 3, 4, 5, and 6 each show one of the inspection devices, for example, a front face inspection device configured to inspect the front face side of the paper sheets.

As shown in FIG. 2, the inspection device 20 comprises a front face inspection device 20 a configured to optically inspect the front face side of a bill, and back face inspection device 20 b configured to optically inspect the back face side of the bill, and these devices are continuously arranged along the transfer path 16. The front face inspection device 20 a and back surface inspection device 20 b have the same configuration, and are arranged symmetrical in the vertical direction. Here, the configuration of the front face inspection device 20 a will be described below in detail as a representative.

As shown in FIGS. 2 to 6, the front face inspection device 20 a comprises a transfer mechanism 40 configured to transfer a bill P through an inspection position on the transfer path 16, a guide plate (guide member) 50 including a guide surface opposed to a front face of the bill P at the inspection position, a light source 60 configured to radiate inspection light toward the inspection position, and a photoreceptor 64 configured to receive the inspection light reflected from a reflection surface 70 a of a white standard plate 70 to be described later, and inspection light reflected from the front face of the bill P at the inspection position. In the front face inspection device 20 a, the light source 60 is caused to emit inspection light, and reflection light from the inspection surface of the bill is received, thereby inspecting the bill. In order to check the reflection light, the white standard plate 70 is provided on the guide plate 50 as a reflector serving as a criterion of the reflection light.

As shown in FIG. 2, the light source 60 comprises a first lamp 62 a and a second lamp 62 b configured to radiate inspection light toward the white standard plate 70 from directions different from each other. The first and second lamps 62 a and 62 b are respectively inclined to the opposite sides with respect to a direction perpendicular to the reflection surface 70 a of the white standard plate 70 by a predetermined angle. A lens is provided at each of emission ends of the first and second lamps 62 a and 62 b. Hereby, the first and second lamps 62 a and 62 b irradiate the bill with linear inspection light slightly longer than a width of the bill P at the inspection position. In the vicinity of the first and second lamps 62 a and 62 b, blowers 64 a and 64 b configured to blow air toward the lenses to prevent adherence of dust are provided.

As shown in FIG. 3, the guide plate 50 comprises a flat main guide surface 52 a extending in the substantially horizontal direction, an inflow side guide surface 52 b positioned on the upstream side of the main guide surface 52 a with respect to the transfer direction A of the bill P, and extending in the downwardly inclined direction, and a downstream side guide surface 52 c formed on the downstream side of the main guide surface 52 a, and formed one step lower than the main guide surface 52 a.

The white standard plate 70 is embedded in a long and thin support rod 74. The support rod 74 extends in a direction perpendicular to the transfer direction A of the bill P, and is provided slidable on the guide plate 50. The white standard plate 70 is formed into a long and thin rectangular shape, and the reflection surface 70 a thereof is exposed on a plane flush with the downstream side guide surface 52 c, and extends in a direction perpendicular to the transfer direction A of the bill P. Elongate rectangular mirrors 76 are embedded in the support rod 74, and are arranged on both sides of the white standard plate 70. Surfaces of these mirrors 76 are exposed on the plane flush with the downstream side guide surface 52 c. The support rod 74 can be drawn out from the guide plate 50 so as to carry out replacement, inspection, washing, and the like of the white standard plate 70 and mirrors 76.

The guide plate 50 includes a plurality of suction holes opening in the guide surface of the guide plate 50, and the suction holes are arranged in two lines in the transfer direction A. A pair of guide grooves 54 are formed in each of the inflow side guide surface 52 b and main guide surface 52 a, and extend in the transfer direction A. The guide grooves 54 forming the pair are spaced apart from each other in a direction perpendicular to the transfer direction A by a distance smaller than the width of the bill P, i.e., by a distance corresponding to a pitch between belts of first transfer belts to be described later. A bottom surface of the guide groove 54 is positioned flush with the front face of the support rod 74 provided with the white standard plate 70. A pair of elongate ribs 55 are formed on the downstream side guide surface 52 c, and extend in the transfer direction A in parallel with the guide grooves 54. Top surfaces of the ribs 55 are positioned flush with the bottom surface of each guide groove 54.

As shown in FIG. 3 and FIG. 7, the suction holes include elongate first suction holes 56 a opening in the bottom surfaces of the guide grooves 54, and extending in the transfer direction A, second suction holes 56 b opening in the top surface of the support rod 74, and extending in the transfer direction A side by side with the first suction holes 56 a, and third suction holes 56 c opening in the top surfaces of the ribs 55, and extending in the transfer direction A side by side with the first and second suction holes.

A suction housing 58 is attached to a part under the guide plate 50, and covers the undersurface side of the guide plate 50. The suction housing 58 defines an air supply chamber 59 which communicates with the first to third suction holes 56 a, 56 b, and 56 c. For example, a suction pump 57 as suction means is connected to the suction housing 58. Air can be sucked by the suction pump 57 from the first to third suction holes 56 a, 56 b, and 56 c through the air supply chamber 59. The suction housing 58 and suction pump 57 constitute a suction device.

As shown in FIG. 2 and FIGS. 4 to 7, the transfer mechanism 40 comprises a pair of first transfer belts 42 extending parallel with each other through the inspection position on the guide plate 50, a pair of second transfer belts 43 coming into contact with the first transfer belts 42 on the upstream side of the inspection position, and configured to transfer a bill by holding end parts of the bill between the second transfer belts 43 and the first transfer belts 42, and a pair of third transfer belts 44 coming into contact with the pair of first transfer belts 42 on the downstream side of the inspection position, and configured to transfer the bill by holding the end parts of the bill between the third transfer belts 44 and the first transfer belts 42.

Each of the first transfer belts 42 is stretched on a plurality of feed rollers including the feed rollers shown in FIG. 2, and extends in the transfer direction. A plurality of suction holes 42 a are formed in each of the first transfer belts 42 with a predetermined pitch in the longitudinal direction. Each of the first transfer belts 42 runs in the guide groove 54 on the guide plate 50, and runs in opposition to the first, second, and third suction holes 56 a, 56 b, and 56 c.

A pair of first feed rollers 45 is provided on the upstream side of the inspection position, and is rotatably supported on a support frame 46. Each of the second transfer belts 43 runs to overlap the first transfer belt 42, is thereafter wound around the first feed roller 45, then separates from the first transfer belt, and runs to return upwardly toward the upstream side from the guide plate 50.

A pair of second feed rollers 47 is provided on the downstream side of the inspection position, and is rotatably supported on a support frame 48. Each of the third transfer belts 44 is wound around the second feed roller 47 from above the guide plate 50, and thereafter runs toward the downstream side to overlap the first transfer belt 42.

A bill P transferred from the upstream side is transferred, in a state where both side end parts thereof are held between the first transfer belts 42 and second transfer belts 43, to the inspection position by these transfer belts. Further, when the bill P has been transferred to a position on the guide plate 50, the second transfer belts 43 separate from the bill P. Then, the bill P is transferred by the first transfer belt in the transfer direction A, in a state where the bill P is sucked through the suction holes 42 a of the first transfer belt 42, and suction holes 56 a, 56 b, and 56 c of the guide plate 50, and is attracted to the first transfer belts 42. Furthermore, after passing through the guide plate 50, the bill P is transferred toward the downstream side in a state where both the side end parts thereof are held between the first transfer belts 42 and third transfer belts 44.

As described above, on the upstream side and downstream side of the inspection position, the bill P is transferred with both the side end parts thereof being held between the belts and, on the guide plate 50, the bill P is transferred with being attracted only to the first transfer belt 42. Hereby, it is possible to transfer the bill P stably without the bill P floating over the guide surface. Furthermore, at the inspection position on the guide plate 50, inspection of the entire front face of the bill P is enabled without the front face side of the bill P being hidden by the second transfer belts 43 or by the third transfer belts 44.

It should be noted that as shown in FIG. 2, air from the blower 64 a is blown toward the lens of the second lamp 62 a, and acts in a direction in which the bill P is pressed against the first transfer belts 42 when the bill P is held again between the first transfer belts 42 and third transfer belts 44. Accordingly, even when the bill P is not sufficiently attracted to the first transfer belts 42, and is in floating contact with the belts 42, it is possible to press the bill P against the first transfer belts 42, and prevent the bill P from not being held between the first and third transfer belts 42 and 44 to cause jamming.

As shown in FIG. 7, there is a suction start position at which suction of the bill P is started, i.e., an upstream side end of each of the first suction holes 56 a formed in the guide plate 50, and there is a branching point B at which the double-belt transfer to be carried out by the first transfer belts 42 and second transfer belts 43 is changed to the single-belt transfer, i.e., a position at which each of the second transfer belts 43 separates from each of the first transfer belts 42. The suction star position is spaced apart from the branching point B on upstream side thereof by at least a length equal to or larger than one hole pitch of the suction holes 42 a formed in the first transfer belts. In the embodiment, the upstream side end of the first suction hole 56 a is positioned upstream from the branching point B by about 1.5 pitches.

The transfer mechanism 40 is provided with a peeling guide plate 49 arranged on the upstream side of the inspection position between the second transfer belts 43. The peeling guide plate 49 is attached to, for example, the support frame 46, protrudes from a position between the first feed rollers 45 in the transfer direction A, and is opposed to the main guide surface 52 a of the guide plate 50 with a gap held between them. If the bill P is adhered to the second transfer belts 43 to be upwardly rolled up at the branching point B at which the double-belt transfer by the first and second transfer belts 42 and 43 is changed to the single-belt transfer of the first transfer belts 42, this peeling guide plate 49 peels the bill P from the second transfer belts 43, and securely guides the bill P to the inspection position side.

As described above, the front face inspection device 20 a carries out inspection by receiving reflection light from the inspection surface of the bill P, and hence when the white standard plate 70 serving as a criterion of the reflection light is defaced, the criterion of the reflection light is changed, and the inspection results are adversely affected. Accordingly, dust or the like is prevented from adhering to the reflection surface 70 a of the white standard plate 70. Thus, as shown in FIGS. 2 to 7, an air nozzle 78 is provided above the guide plate 50. Compressed air is supplied from air supply means (not shown) to the air nozzle 78, and air is blown from a distal end of the nozzle 78 toward the white standard plate 70. That is, compressed air is blown from the opposite side of the white standard plate 70 with respect to the bill P toward the white standard plate. Hereby, the air nozzle 78 carries out a function of reducing the degree of flotation of the bill P during the transfer, and blowing away dust adhering to the white standard plate 70.

Furthermore, the front face inspection device 20 a comprises an air supply device 80 configured to spout air flowing from a lateral position of the white standard plate 70 along the reflection surface and form an air curtain 82 between the white standard plate and bill, in order to blow away dust even during inspection of the bill. As shown in FIGS. 3 to 6, and 8, the air supply device 80 includes a plurality of air nozzles 84 embedded in the guide plate 50, and supply means such as an air compressor 85 and the like configured to supply compressed air to the air nozzles 84. The air nozzles 84 extend in the transfer direction A of the bill P, and are arranged side by side in a direction perpendicular to the transfer direction of the bill P. Nozzle tip ends of these air nozzles 84 are opened at a step part 53 of the main guide surface 52 a in the vicinity of the side edge of the white standard plate 70.

The air compressor 85 supplies compressed air to the air nozzles 84 and the air nozzles 84 spout air to form the air curtain 82 flowing from the upstream side toward the downstream side in the transfer direction A of the bill P is formed on the reflection surface 70 a of the white standard plate 70. A width of the air curtain 82 is set substantially equal to or slightly smaller than the length of the white standard plate 70.

By forming such an air curtain 82 between the white standard plate 70 and bill P, dust is blown away even during inspection of the bill, and dust is prevented from adhering to the white standard plate. In the air curtain 82, the flow of air is faster than the surrounding air, and hence has negative pressure as compared with the surroundings. Accordingly, when transferred along the white standard plate 70, the bill P is attracted to the white standard plate side. Floating of the bill P is thereby prevented. Floating of the bill P at the inspection position adversely affects the state of the reflection light, and hence is undesirable. Further, air is flowing, and hence the bill does not come into contact with the white standard plate 70.

As shown in FIGS. 3 to 5, on the white standard plate 70, a pair of wire guides are arranged at borders of the air curtain 82. On the downstream side guide surface 52 c of the guide plate 50, two guide ribs 88 are formed, and extend in the transfer direction A. These guide ribs 88 are provided in such a manner that the ribs 88 are separated from each other in a direction perpendicular to the transfer direction with a distance substantially equal to the width of the air curtain 82 held between them. Top surfaces of the guide ribs 88 are positioned flush with the main guide surface 52 a. The wire guides 86 are provided between the step part 53 of the main guide surface 52 a and upstream side ends of the guide ribs 88 in a straddling manner, and extend in the transfer direction A. These wire guides 86 prevent the bill from coming into contact with the white standard plate 70 outside the range of the air curtain 82.

According to the front face inspection device 20 a configured as described above, by spouting air from the lateral direction of the white standard plate 70 along the surface thereof to form the air curtain 82, it is possible to securely prevent dust from adhering to the white standard plate, and also prevent the bill from coming into contact with, and defacing the white standard plate. At the same time, negative pressure is created by the air curtain 82 on the guide plate 50 side with the bill being a border, whereby it is possible to prevent the bill from floating from the guide plate. Hereby, it becomes possible to retain the front face of the bill at the correct inspection position, and accurately carry out inspection. Furthermore, by providing the wire guides 86 at the borders of the range of the air curtain 82, it is possible to prevent the bill P from coming into contact with, and deface the white standard plate 70 outside the range of the air curtain 82.

Further, air is sucked through suction holes 42 a formed in the first transfer belts 42, and the bill P is transferred by being attracted to the first transfer belt by air suction. At this time, by starting suction of the bill P from the double-belt-holding part formed by both the first and second transfer belts 42 and 43, it is possible to securely attract the bill to the first transfer belts 42 by the suction, and transfer the bill to the inspection position in a stable state. Furthermore, by providing the peeling guide plate 49, it becomes possible to peel the bill P from the second transfer belts 43, and securely transfer the bill P to the inspection position side.

It should be noted that as described previously, the back surface inspection device 20 is also configured in the same manner as the aforementioned front face inspection device 20 a, and is provided vertically opposite to the front face inspection device 20 a.

From the above, it is possible to obtain a paper sheets inspection apparatus capable of preventing defacement of the standard plate, accurately transferring the paper sheets to the desired inspection position, and improving the inspection accuracy.

While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.

For example, the shape, number, and the like of the suction holes provided on the guide plate can be changed as the need arises without being limited to the aforementioned embodiment. The object to be inspected is not limited to bills, and the apparatus can be applied to various paper sheets. 

What is claimed is:
 1. A paper sheets inspection apparatus comprising: a transfer mechanism configured to transfer paper sheets in a transfer direction through an inspection position; a guide member including a guide surface opposed to the paper sheet at the inspection position; a standard plate on the guide member, including a reflection surface exposed on the guide surface at the inspection position; an air supply device configured to form an air curtain that flows from the upstream side toward the downstream side along the transfer direction between the reflection surface and the paper sheet to create a negative pressure by which the paper sheet is attracted to the reflection surface, the air supply device including a plurality of air nozzles attached to the guide member in which each of the nozzles are arranged side by side to spout compressed air that forms the air curtain; a light source configured to radiate inspection light toward the reflection surface of the standard plate; and a photoreceptor configured to receive the inspection light reflected from the reflection surface of the standard plate, and the inspection light reflected from a surface of the paper sheet at the inspection position.
 2. The paper sheets inspection apparatus according to claim 1, further comprising wire guides each arranged outside the reflection surface of the standard plate at borders of the air curtain, extending in the transfer direction of the paper sheets, and positioned between the paper sheet and the guide surface.
 3. The paper sheets inspection apparatus according to claim 2, wherein the guide member comprises suction holes opened on the guide surface and arranged in lines in the transfer direction of the paper sheets, and the transfer mechanism comprises a pair of first transfer belts, each of which includes a plurality of suction holes formed at intervals in a longitudinal direction of the belt, and which extend in parallel with each other to run on the suction holes of the guide member, and further comprising a suction device configured to suck air through the suction holes of the guide member and the suction holes of the first transfer belts, and attract the paper sheet to the first transfer belts.
 4. The paper sheets inspection apparatus according to claim 3, wherein the transfer mechanism comprises a pair of second transfer belts coming into contact with the pair of first transfer belts on an upstream side of the inspection position and configured to transfer a paper sheet by holding end parts of the paper sheet between the second transfer belts and the first transfer belts, and a pair of third transfer belts coming into contact with the pair of first transfer belts on a downstream side of the inspection position and configured to transfer the paper sheet by holding the end parts of the paper sheet between the third transfer belts and the first transfer belts, and the suction holes of the guide member include suction holes opposing a part at which each of the first transfer belts and each of the second transfer belts overlap each other.
 5. The paper sheets inspection apparatus according to claim 4, wherein the transfer mechanism comprises a separation guide arranged on the upstream side of the inspection position between the second transfer belts and configured to guide a paper sheet fed from a holding part between each of the first transfer belts and each of the second transfer belts in a direction toward the inspection position.
 6. The paper sheets inspection apparatus according to claim 1, wherein the guide member comprises suction holes opened on the guide surface and arranged in lines in the transfer direction of the paper sheets, and the transfer mechanism comprises a pair of first transfer belts, each of which includes a plurality of suction holes formed at intervals in a longitudinal direction of the belt, and which extend in parallel with each other to run on the suction holes of the guide member, and further comprising a suction device configured to suck air through the suction holes of the guide member and the suction holes of the first transfer belts, and attract the paper sheet to the first transfer belts.
 7. The paper sheets inspection apparatus according to claim 6, wherein the transfer mechanism comprises a pair of second transfer belts coming into contact with the pair of first transfer belts on an upstream side of the inspection position and configured to transfer a paper sheet by holding end parts of the paper sheet between the second transfer belts and the first transfer belts, and a pair of third transfer belts coming into contact with the pair of first transfer belts on a downstream side of the inspection position and configured to transfer the paper sheet by holding the end parts of the paper sheet between the third transfer belts and the first transfer belts, and the suction holes of the guide member include suction holes opposing a part at which each of the first transfer belts and each of the second transfer belts overlap each other.
 8. The paper sheets inspection apparatus according to claim 7, wherein the transfer mechanism comprises a separation guide arranged on the upstream side of the inspection position between the second transfer belts and configured to guide a paper sheet fed from a holding part between each of the first transfer belts and each of the second transfer belts in a direction toward the inspection position.
 9. The paper sheets inspection apparatus according to claim 1, wherein the light source comprises a first lamp and a second lamp configured to radiate inspection light toward the standard plate from directions different from each other.
 10. The paper sheets inspection apparatus according to claim 1, further comprising an air nozzle configured to blow air from the opposite side of the standard plate with respect to the paper sheet toward the standard plates. 